package com.company.ems.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "AuthenticationFilter", urlPatterns = {"/dashboard.jsp", "/employee/*"})
public class AuthenticationFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        HttpSession session = httpRequest.getSession(false);

        // 检查用户是否已登录
        boolean isLoggedIn = (session != null && session.getAttribute("user") != null);

        if (isLoggedIn) {
            // 用户已登录，继续请求
            chain.doFilter(request, response);
        } else {
            // 用户未登录，重定向到登录页面
            httpResponse.sendRedirect(httpRequest.getContextPath() + "/login.jsp");
        }
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void destroy() {}
}